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From:   Stephen Boyd <swboyd@chromium.org>
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Date:   Mon, 6 Jun 2022 12:16:48 -0700
Message-ID: <CAE-0n51Lq381dQW6zw3D0fibdj=Jm4r3uAYG59ySo4CXbx+EpA@mail.gmail.com>
Subject: Re: [PATCH v4 8/8] drm/mediatek: Config orientation property if panel
 provides it
To:     Chun-Kuang Hu <chunkuang.hu@kernel.org>,
        Hsin-Yi Wang <hsinyi@chromium.org>
Cc:     Hans de Goede <hdegoede@redhat.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        dri-devel@lists.freedesktop.org,
        linux-mediatek@lists.infradead.org,
        Rob Clark <robdclark@chromium.org>,
        Douglas Anderson <dianders@chromium.org>,
        Rob Herring <robh+dt@kernel.org>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
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Quoting Hsin-Yi Wang (2022-06-06 08:24:31)
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index d9f10a33e6fa..c56282412bfa 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -822,6 +823,12 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
>                 ret = PTR_ERR(dsi->connector);
>                 goto err_cleanup_encoder;
>         }
> +
> +       /* Read panel orientation */
> +       if (dsi->panel)
> +               drm_connector_set_panel_orientation(dsi->connector,
> +                               drm_panel_get_orientation(dsi->panel));
> +

It could be simplified like so?

	drm_connector_set_orientation_from_panel(dsi->connector, dsi->panel);

Then the API could get the orientation if the panel pointer is valid.
Does any code need to use/modify the orientation value besides
drm_connector_set_panel_orientation()?

>         drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
>
>         return 0;